/*
 * Copyright 2010 - 2011, The PLDesktop Development Team
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "string.h"

extern "C" void *memmove(void *s1, const void *s2, size_t n) {
	if (s1 <= s2) {
		memcpy(s1, s2, n);
	} else {
		uint8_t *dest8 = (uint8_t*)s1 + n;
		const uint8_t *src8 = (const uint8_t*)s2 + n;
		while ((((uintptr_t)dest8 - 1) % 4) != 0 && n != 0) {
			*--dest8 = *--src8;
			--n;
		}
		uint32_t *dest32 = (uint32_t*)dest8;
		const uint32_t *src32 = (const uint32_t*)src8;
		while (n >= 4) {
			*--dest32 = *--src32;
			n -= 4;
		}
		dest8 = (uint8_t*)dest32;
		src8 = (const uint8_t*)src32;
		while (n != 0) {
			*--dest8 = *--src8;
			--n;
		}
	}
	return s1;
}
